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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jul. 31, 2015
Dec. 31, 2014
Level 3 | White Oak      
FAIR VALUE MEASUREMENTS      
Long-term debt $ 10,400 $ 14,800  
Estimated fair value | Level 2 | Recurring      
FAIR VALUE MEASUREMENTS      
Long-term debt 819,099   $ 833,351
Total 819,099   $ 833,351
Estimated fair value | Level 3 | Recurring      
FAIR VALUE MEASUREMENTS      
Contingent consideration 10,400    
Total $ 10,400